diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 03a58402..7dd55ba6 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -273,7 +273,7 @@ CB_DIAGLVL	.DB	DIAGLVL		; ROMWBW HBIOS DIAGNOSTIC LEVEL
 CB_HEAP		.DW	0
 CB_HEAPTOP	.DW	0
 ;
-; STANDARD BANK ID'S START AT $D8
+; STANDARD BANK ID'S START AT $D8. DEFAULT VALUES FOR 512KB SYSTEM WITH NO RESERVED BANKS
 ;
 		.FILL	(HCB + $D8 - $),0
 ;
@@ -1060,6 +1060,7 @@ HB_IVT0F:	JP	HB_BADINT \ .DB 0
 ;==================================================================================================
 ;
 HB_START:
+;
 #IFDEF APPBOOT
   #IF (MEMMGR == MM_Z280)
 	LD	A,%00000001
@@ -1076,7 +1077,7 @@ HB_START:
 Z280_BOOTERR	.TEXT	"\r\n\r\n*** Application mode boot not supported under Z280 native memory management!!!\r\n\r\n$"
   #ENDIF
 #ENDIF
-
+;
 	DI				; NO INTERRUPTS
 	IM	1			; INTERRUPT MODE 1
 ;
@@ -1337,6 +1338,38 @@ Z280_INITZ:
 	LD	DE,0
 	LD	BC,$8000
 	CALL	HBX_BNKCPY
+#IF (1)
+;
+; POPULATE THE CRITICAL RAM BANK NUMBERS.
+;
+; ASSUME THAT CB_RAMBANKS IS THE NUMBER OF 32K RAM BANKS THAT HAS BEEN SET EITHER
+; AT ASSEMBLY TIME OR BY PROBING THE ACTUAL AVAILABLE MEMORY (NOT IMPLEMENTED YET).
+;
+	call	dbg
+	LD	A,(CB_RAMBANKS)			; CALCULATE START
+	DEC	A				; RAMBANK AFTER
+	ADD	A,($80 + (PLT_RAM_R / 32))	; RESERVED BANKS
+;
+	LD	HL,CB_BIDCOM
+	LD	B,4
+CB_IDS:	LD	(HL),A				; POPULATE CB_BIDCOM
+	INC	HL				; POPULATE CB_BIDUSR
+	DEC	A				; POPULATE CB_BIDBIOS
+	DJNZ	CB_IDS				; POPULATE CB_BIDAUX
+
+	LD	A,(CB_BIDUSR)
+	LD	(HB_SRCBNK),A			; POPULATE HB_SRCBNK
+	LD	(HB_DSTBNK),A			; POPULATE HB_DSTBNK		
+;
+	LD	A,+($80 + (PLT_RAM_R / 32))	; POPULATE CB_BIDRAMD0	; START RAMBANK
+	LD	(HL),A
+	INC	HL
+;
+	LD	A,(CB_RAMBANKS)			; POPULATE CB_BIDRAMDN	; END RAMBANK
+	DEC	A
+	SUB	TOT_RAM_RB
+	LD	(HL),A
+#ENDIF
 ;
 ; TRANSITION TO HBIOS IN RAM BANK
 ;
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index 1c52024d..2bde16ac 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -488,9 +488,6 @@ SYSTIM	.SET	TM_Z280
 ;
 ; MEMORY BANK CONFIGURATION
 ;
-RAMSIZE		.SET	0
-;PLT_RAM_R	.SET	0	; 0K	; RESERVED RAM FOR EACH PLATFORM IS DEFINED IN ITS CONFIG FILE
-;PLT_ROM_R	.SET	0	; 0K	; RESERVED ROM FOR EACH PLATFORM IS DEFINED IN ITS CONFIG FILE
 WBW_ROM_R	.EQU	128	; 128K			; RESERVED ROM REQUIRED FOR ROMWBW
 WBW_RAM_R	.EQU	256	; 256K			; RESERVED RAM REQUIRED FOR ROMWBW
 TOT_ROM_RB	.EQU	(PLT_ROM_R + WBW_ROM_R)/32	; TOTAL ROM BANKS RESERVED